Joshua 6:4-6

4Seven priests will walk ahead of the Ark, each carrying a ram’s horn. On the seventh day you are to march around the town seven times, with the priests blowing the horns.

5When you hear the priests give one long blast on the rams’ horns, have all the people shout as loud as they can. Then the walls of the town will collapse, and the people can charge straight into the town.”

6So Joshua called together the priests and said, “Take up the Ark of the Lord’s Covenant, and assign seven priests to walk in front of it, each carrying a ram’s horn.”